A language caters to an ecosystem. Most ecosystems change and unless you are continually learning, the definition of "pro" becomes ambiguous. Despite who my e

A language caters to an ecosystem. Most ecosystems change and unless you are continually learning, the definition of "pro" becomes ambiguous. Despite who my employer is, I know much more about the internals and libraries associated with BSD and Linux related programming in the language of "C" than I do Win. Where do I declare myself an expert? "stdlib"? "stdio"? And so forth. I'm continually a student in the areas that pop up that interest me (and the ones I wish to maintain).